Colorado QuickInfoEst. Pop.:4,304,359Capital:DenverStatehood:1876Nicknames:Highest State, Centennial State, Columbine StateMotto:Nil Sine Numine.Official WebsiteCensus InfoFun Colorado FactoidDenver has the largest city park system in the nation with 205 parks in City limits and 20,000 Acres of parks in the nearby mountains.